Carlos E. R. wrote:
On 2023-04-29 14:44, Per Jessen wrote:
> For example, with IPv6 you can send email directly from your > machine to somebody else direct, without any intermediate mail > server collecting it.
Um, same with IPv4.
If you have routable addresses.
No, that is not necessary.
Technically, I can send a mail from my MUA here on 192.168.77.88 behind NAT directly to any mailserver on public IPv4. Of course, any semi-qualified mail admin will block that due to reverse lookup failure, but that applies to IPv6 too.
Technically, yes, but that is not what I'm suggesting.
Well, maybe you would care to explain exactly what you _are_ suggesting. It is difficult having a sane conversation when half the information is omitted.
I did, in the next paragraph.
A bit late, after seventeen posts back and forth - don't you think?
I'm suggesting sending to your friend "whatever" who is also behind NAT, without using a mail server outside.
Rapidly moving goalposts ...
No, I haven't. I have been saying this from minute 1, but you did not understand, so I had to change my wordings, which instead you interpret as moving the goalposts.
Carlos, you _never_ talked about reaching an IP address behind NAT. You have only introduced that complexity _now_ Re-read what you wrote, it is all quoted above.
Why don't you open port 25 on your router and forward it a postfix instance. If it is suitably configured, I'll be happy to send you an email - directly - from this workstation (on 192.168.2.114). I'll even use telnet.
Because with IPv6 the forwarding part is not needed. That's the whole point.
Please re-read what you posted, above. Please.
I am not using either. I don't understand why you think so.
It is perfectly feasible using e.g. "Ekiga" to contact, i.e. start a SIP session to a VoIP device (on port 5060) on public IPv4 or IPv6. I don't understand why you are so intent on turning SIP into black magic, with STUN servers and directories and whathaveyou.
You said: public IPv4. We people don't have public IPv4.
I don't care, it was never mentioned as a condition. If you set up the proper port forwarding, I can _still_ call you directly.
Or having to define virtual servers in the routers involved.
Huh? You have totally lost me. Virtual servers?
It is how routers call "port forwarding". It is on my router manual.
Well, maybe you should just start writing in Spanish, I guess that is also in your manual.
Let me explain what _I_ am saying -
Using e.g. "ekiga" I can dial a public ip address and establish a phone
public address. Not a NATted address.
Why did you feel the need to emphasize that? I'm sorry, I give up. Please re-read what you posted, above. Please. You never once mentioned NAT'ed addresses. -- Per Jessen, Zürich (20.1°C) Member, openSUSE Heroes (2016 - present) We're hiring - https://en.opensuse.org/openSUSE:Heroes